I have the same question for my 380SE, which I believe uses the same engine (M116?) with smaller displacement. There are 2 belts which drive both the p/s pump and the h2o pump. I can't for the life of me figure out how the pump can swivel to adjust the tension. Anyone?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280